Abstract
Intuitionistic fuzzy sets are suitable for capturing imprecise or uncertain decision information in multiple criteria decision analysis. In addition, optimism and pessimism generally affect the manner in which subjective judgments are construed. This paper proposes an outranking model, a QUALIFLEX method, for relating optimism and pessimism within the intuitionistic fuzzy decision environment. This paper treats the influences of optimism and pessimism differently by using the unipolar bivariate model. In addition, the proposed method investigates all possible permutations of alternatives with respect to the consequences of all criteria. A ranking procedure is employed to compare intuitionistic fuzzy values by using the inclusion comparison probability.
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